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arXiv astro-ph/0211237astro-ph
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ULIRGs的XMM-牛顿观测I:IRAS19254-7245中康普顿厚度的AGN

XMM-Newton observations of ULIRGs I: A Compton-thick AGN in IRAS19254-7245

V. Braito, A. Franceschini, R. Della Ceca, P . Severgnini, L. Bassani, M. Cappi, G. Malaguti, G. G. C. Palumbo, M. Persic, G. Risaliti, M. Salvati

摘要:

我们介绍了合并系统IRAS 19254-7245的XMM-牛顿观测,也被称为超天线,其南核被归类为塞弗特2星系。XMM-Newton数据使我们能够对该系统进行详细的X射线成像和光谱分析。我们清楚地检测到,在这个系统中的第一次,在6.49+/-0.1 keV(休息帧)的EW ~ 1.4 keV的Fe发射线。X射线光谱需要一个软的热分量(kT~0.9 keV; L(0.5-2)~ 4 E41 cgs),可能与星暴有关,以及一个硬的幂律连续谱(观察到的L(2-10)~ 4 E42 cgs)。我们证实了平坦的后一个组成部分,已经注意到在以前的ASCA数据。这种平坦性,加上强的Fe-K α线和其他宽带指标的检测,表明存在一个康普顿厚度的活动星系核,其内部亮度> 1 E44 cgs。我们表明,康普顿厚模型可以完美地再现该对象的X射线光谱特性。

英文摘要:

We present the XMM-Newton observation of the merging system IRAS 19254-7245, also known as The Superantennae, whose southern nucleus is classified as a Seyfert 2 galaxy. The XMM-Newton data have allowed us to perform a detailed X-ray imaging and spectral analysis of this system. We clearly detect, for the first time in this system, a strong EW ~ 1.4 keV Fe emission line at 6.49+/-0.1 keV (rest-frame). The X-ray spectrum requires a soft thermal component (kT~0.9 keV; L(0.5-2) ~ 4E41 cgs), likely associated with the starburst, and a hard power-law continuum above 2 keV (observed L(2-10) ~ 4E42 cgs). We confirm the flatness of this latter component, already noted in previous ASCA data. This flatness, together with the detection of the strong Fe-Kalpha line and other broad band indicators, suggest the presence of a Compton-thick AGN with intrinsic luminosity > 1E44 cgs. We show that a Compton-thick model can perfectly reproduce the X-ray spectral properties of this object.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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